Missouri River Basin Streamflow Fcst as of May 1, 2016 Missouri River Basin Mountain Snowpack as of May 1, 2016
Upper Missouri Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER MISSOURI BASIN AS OF
MAY 1 WAS BELOW AVERAGE. THE SNOW PACK ABOVE TOSTON,
MONTANA WAS 69 PERCENT OF AVERAGE. THE SNOW PACK BETWEEN TOSTON
AND FORT PECK, MONTANA WAS 64 PERCENT. THE SNOW PACK IN THE
ST MARY AND MILK RIVER BASINS WAS 65 PERCENT.
APRIL PRECIPITATION ACROSS THE UPPER MISSOURI BASIN RANGED FROM
NEAR TO ABOVE AVERAGE. BASIN PRECIPITATION SUMMARIES FOR THE MISSOURI
BASIN INCLUDE: MILK ST. MARY, 65 PERCENT; MILK CANADA, 192 PERCENT;
LOWER MILK, 291 PERCENT; ABOVE TOSTON, 90 PERCENT; TOSTON TO
FT. PECK, 173 PERCENT.
April 2016 Upper Missouri Mean Precip Oct-Apr WY2016 Upper Missouri Mean Precip
STREAM FLOW IN THE UPPER MISSOURI BASIN IS FORECAST TO BE
NEAR AVERAGE DURING THE UPCOMING SPRING AND SUMMER. THE ST.
MARY RIVER IS FORECAST TO HAVE 81 PERCENT OF AVERAGE APRIL-SEPTEMBER
FLOWS. RUNOFF IS EXPECTED TO RANGE AROUND 75 PERCENT OF AVERAGE
FOR THE MISSOURI BASIN ABOVE FORT PECK, MONTANA.
Upper Missouri May 1, 2016 Spring and Summer Streamflow Forecasts
OF THE FOUR MAJOR IRRIGATION RESERVOIRS IN MONTANA: LIMA RESERVOIR
HAD 111 PERCENT AVERAGE STORAGE, CLARK CANYON WAS HOLDING 87 PERCENT OF
AVERAGE WATER, GIBSON RESERVOIR HAD 122 PERCENT OF AVERAGE STORED
WATER, AND FRESNO RESERVOIR HAD 114 PERCENT OF AVERAGE STORED WATER.
THE MAJOR HYDROELECTRIC RESERVOIRS IN MONTANA (CANYON FERRY AND
FORT PECK) HAD MONTHEND STORAGE IN THE AVERAGE TO BELOW AVERAGE
RANGE; 107 AND 114 PERCENT OF AVERAGE WATER, RESPECTIVELY.
Yellowstone Basin
THE HIGH ELEVATION SNOW PACK IN THE YELLOWSTONE BASIN WAS NEAR AVERAGE
ON MAY 1. THE SNOW PACK IN THE UPPER YELLOWSTONE BASIN WAS
72 PERCENT OF AVERAGE. THE SNOW PACKS IN THE WIND, BIGHORN, AND
SHOSHONE BASINS WERE 120, 103, AND 82 PERCENT OF AVERAGE,
RESPECTIVELY. THE SNOW PACKS IN THE TONGUE AND POWDER BASINS WERE
93 AND 104 PERCENT OF AVERAGE, RESPECTIVELY.
PRECIPITATION DURING APRIL WAS NEAR TO ABOVE AVERAGE. THE UPPER
YELLOWSTONE RIVER BASIN RECEIVED 79 PERCENT OF AVERAGE PRECIPITATION
WHILE THE LOWER YELLOWSTONE BASIN REPORTED 158 PERCENT OF AVERAGE.
THE BIGHORN BASIN RECEIVED 201 PERCENT OF AVERAGE PRECIPITATION
WHILE THE WIND RIVER BASIN RECEIVED 272 PERCENT OF AVERAGE.
THE LITTLE BIGHORN - UPPER TONGUE BASIN RECEIVED 191 PERCENT OF
AVERAGE AND THE POWDER RIVER HAD 193 PERCENT OF AVERAGE PRECIPITATION.
April 2016 Yellowstone Mean Precip Oct-Apr WY2016 Yellowstone Mean Precip
FORECAST STREAM FLOW IN THE YELLOWSTONE BASIN IS ABOVE TO BELOW
AVERAGE RANGE FOR THE UPCOMING SPRING AND SUMMER. STREAM
FLOW FOR THE WIND-BIGHORN BASIN ABOVE ST. XAVIER, MONTANA IS
FORECAST TO BE ABOUT 120 PERCENT OF AVERAGE. FLOW IN THE
TONGUE BASIN IS EXPECTED TO BE 87 PERCENT OF AVERAGE. FLOWS IN THE
POWDER RIVER ARE EXPECTED TO BE ABOUT 92 PERCENT OF AVERAGE.
MONTHEND STORAGE AT BOYSEN RESERVOIR WAS 120 PERCENT OF AVERAGE.
STORED WATER IN BUFFALO BILL RESERVOIR WAS 134 PERCENT OF AVERAGE.
MONTHEND STORAGE WAS 102 PERCENT OF AVERAGE AT BIGHORN RESERVOIR.
Yellowstone May 1, 2016 Spring and Summer Streamflow Forecasts
Platte Basin
THE HIGH ELEVATION SNOW PACK IN THE UPPER NORTH PLATTE BASIN WAS
111 PERCENT OF AVERAGE ON MAY 1. THE SNOW PACK IN THE NORTH
PLATTE BASIN BELOW SEMINOE RESERVOIR WAS 165 PERCENT OF AVERAGE.
THE SNOW PACK IN THE SOUTH PLATTE BASIN WAS 118 PERCENT OF AVERAGE.
APRIL PRECIPITATION ACROSS THE PLATTE BASIN WAS ABOVE
AVERAGE. PRECIPITATION IN THE UPPER NORTH PLATTE ABOVE SEMINOE RESERVOIR
WAS 146 PERCENT OF AVERAGE. IN THE LOWER NORTH PLATTE BETWEEN SEMINOE
RESERVOIR AND GUERNSY RESERVOIR PRECIPITATION WAS 183 PERCENT OF AVERAGE.
THE NORTH PLATTE PLAINS BELOW GUERNSY RESERVOIR HAD 207 PERCENT OF AVERAGE
PRECIPITATION. THE HIGH ELEVATIONS OF THE SOUTH PLATTE BASIN HAD 145
PERCENT OF AVERAGE PRECIPITATION WHEREAS THE PLAINS HAD 193 PERCENT OF AVERAGE
APRIL PRECIPITATION.
April 2016 Platte Mean Precip Oct-Apr WY2016 Platte Mean Precip
STREAM FLOW IN THE PLATTE BASIN IS FORECAST TO BE ABOVE
AVERAGE DURING THE UPCOMING SPRING AND SUMMER.
RUNOFF FOR STREAMS ABOVE SEMINOE RESERVOIR IS FORECAST NEAR
120 PERCENT OF AVERAGE. STREAM FLOWS FOR THE NORTH PLATTE
BELOW SEMINOE RESERVOIR ARE FORECAST TO BE 128 PERCENT OF
AVERAGE. STREAMS IN THE SOUTH PLATTE BASIN ABOVE SOUTH PLATTE,
COLORADO CAN EXPECT 110 PERCENT OF AVERAGE FLOW. FOR THE
REMAINDER OF THE SOUTH PLATTE BASIN FLOWS ARE EXPECTED NEAR
110 PERCENT OF AVERAGE.
STORED WATER IN THE SOUTH PLATTE BASIN WAS 108 PERCENT OF AVERAGE
ON APRIL 1. STORED WATER IN THE NORTH PLATTE BASIN WAS 127
PERCENT OF AVERAGE.
North Platte Streamflow Fcst South Platte Streamflow Fcst
